API 5CT PIPE (CASING / TUBING OCTG)

APPLICATION

The API 5CT standard covers seamless and welded casing and tubing pipes for upstream operations (OCTG = oil country tubular goods). Casing pipes are available in the diameter range 4 1/2 . to 20 inches, and in the following materials: H-40 / J-55 / K-55 / N-80 / L-80 / C-90/ T-95 / P-110 / Q-125. The main types of connections for casing pipes are STC (short threads), LTC (long threads), BTC (buttress threads) and premium gas tight connections. Tubing pipes are manufactured in seamless and welded execution, in the size range 1.050 to 5 1/2 inches and in the following material grades: H-40 / J-55 / K-55 / N-80 / L-80 / C-90/ T-95 / P-110 / Q-125. The main types of connections for tubing pipes are: NUE (non upset), EUE (external upset) and premium. 
 

MATERIAL GRADES / CHEMICAL COMPOSITION

API Grade C≤ Si≤ Mn≤ P≤ S≤ Cr≤ Ni≤ Cu≤ Mo≤ V≤ Als≤
API 5CT J55 0.34-0.39 0.20-0.35 1.25-1.50 0.02 0.015 0.15 0.2 0.2 / / 0.02
API 5CT  K55 0.34-0.39 0.20-0.35 1.25-1.50 0.02 0.015 0.15 0.2 0.2 / / 0.02
API 5CT N80 0.34-0.38 0.20-0.35 1.45-1.70 0.02 0.015 0.15 / / / 0.11-0.16 0.02
API 5CT  L80 0.15-0.22 1 0.25-1.00 0.02 0.01 12.0-14.0 0.2 0.2 / / 0.02
API 5CT J P110 0.26-035 0.17-0.37 0.40-0.70 0.02 0.01 0.80-1.10 0.2 0.2 0.15-0.25 0.08 0.02

 

MECHANICAL PROPERTIES

API Grade Yield Strength (Mpa) Tensile Strength (Mpa)
API 5CT J55 379-552 ≥517
API 5CT K55 ≥655 ≥517
API 5CT N80 552-758 ≥689
API 5CT L80 552-655 ≥655
API 5CT P110 758-965 ≥862

 

TOLERANCES

Execution Outer Diameter Wall Thickness
Cold rolled Tube sizes(mm) Tolerances(mm)  
<114.3 ±0.79 -12.5%  
≥114.3 -0.5%,+1%    

 

 

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